| abstract |
(57) [Summary] [Structure] A polyester sheet is used for the main layer and the sublayer 2 or 3 A heat-sealability is imparted by using a non-crystalline copolyester resin for the sub-layer as a layer structure. Using the co-extrusion device, the polyester resin to be the main layer is put into the main extrusion machine, and the copolyester resin to be the sub-layer is introduced into the sub-extrusion machine, and the co-extrusion T die is used to form two or three layers, and then the take-out is performed. The thickness adjustment, cooling, and winding are performed by an apparatus to obtain a heat-sealable polyester sheet. [Effects] According to the present invention, a heat-sealable polyester sheet can be obtained, and by utilizing this feature, it can be processed into blister packaging for various packaging, food trays, and containers. |